Bearings

Question 1

What is the purpose of bearings?

Answer 1

Enables rotational or linear movement while reducing friction and handles stress.

Question 2

What do ball bearings do?

Answer 2

Carries the weight of the load, this force drives the bearings rotation.

Question 3

What are the two kinds of loading?

Answer 3

Radial (shaft sidewards loads) and Axial/Thrust loads (shaft longitudinal loads)

Question 4

What are compound loads?

Answer 4

Loads that are in both directions Axial and Radial.

Question 5

What does frictional resistance do?

Answer 5

Produces heat which impacts performance.

Question 6

What loads do ball bearings handle?

Answer 6

Axial or Thrust loads

Question 7

What loads do roller bearings handle?

Answer 7

Radial loads (sideward loads)

Question 8

Roller bearings are used for long life and endurance for?

Answer 8

Heavy and shock loads. They have a larger load carrying capacity.

Question 9

Types of plain bearings?

Answer 9

Journal bearings, spherical plain bearings and air bearings.

Question 10

Journal bearings consist of?

Answer 10

Load carrying cylindrical inserts made with white metal called Babbitt.

Question 11

What does oil do in journal bearings?

Answer 11

Oil supports the shaft preventing metal to metal contact.

Question 12

How does oil film carry?

Answer 12

The hydrodynamic principle, there must be some clearance with the stationary part and rotating part.

Question 13

Spherical bearings allow?

Answer 13

More or less angular alignment correction.

Question 14

Spherical bearings are not intended for?

Answer 14

Rotation

Question 15

Spherical bearings can have grease nipples but are mainly?

Answer 15

Maintenance free and are self lubricating.

Question 16

Air bearings use what to provide low friction load bearing interface between surfaces?

Answer 16

A thin film of pressurised air.

Question 17

Rolling element of ball bearings?

Answer 17

Steels balls rotate in grooved raceways

Question 18

Rolling element of Roller bearings use?

Answer 18

Cylindrical, tapered and spherical rollers running in suitably shaped raceways

Question 19

What loads do ball bearings and tapered roller bearings both accept?

Answer 19

Both radial and axial (thrust) loads

Question 20

Other types of roller bearings accept only?

Answer 20

Radial loads

Question 21

Ball bearings consist of?

Answer 21

Inner and outer race separated by hardened steel balls

Question 22

Ball bearings are designed for?

Answer 22

Radial or axial (thrust) loads or a combination of both. Are rigid or self aligning.

Question 23

Roller bearings are normally only used for?

Answer 23

Radial loads but can compensate for linear expansion of the shaft or housing.

Question 24

Three types of Roller bearings

Answer 24

Cylindrical
Spherical
Tapered

Question 25

Taper roller bearings are made from?

Answer 25

Hardened steel

Question 26

Needle roller bearings are thin cylindrical rollers that’s length is

Answer 26

Four times longer than the diameter

Question 27

Needle roller bearings can support?

Answer 27

A greater load and require less clearance between the axle and surrounding structure

Question 28

Needle bearings are used for?

Answer 28

Low speeds or swinging movements. And for fluctuating and surge loads

Question 29

Needle bearings support only?

Answer 29

Radial loads

Question 30

Thrust bearings are designed for retaining?

Answer 30

Axial forces

Question 31

What type of bearing must not work unloaded?

Answer 31

Thrust bearings , it prevents slipping of the balls

Question 32

Cylindrical roller thrust bearings must not be operated unloaded because

Answer 32

You must prevent slipping of rolling elements